Theta transcranial alternating stimulation (tACS) enhanced neural oscillations mediating arithmetic calculation

[Speaker] Katsurakawa, Motomu:1,2
[Co-author] Kitajo, Keiichi:2
1:Graduate school of medicine, University of Tokyo (Japan), 2:Rhythm-based brain information processing unit, RIKEN BSI-TOYOTA collaboration center (Japan)

Previous electroencephalography (EEG) studies have shown that enhanced neural oscillations in the theta-band are induced during working memory tasks and arithmetic calculation tasks over the frontal cortex. To investigate the causal relationship between theta-band oscillations and information processing for arithmetic calculation, we used transcranial alternating current stimulation (tACS), which can modulate rhythmic human brain activity. We delivered tACS over the frontal cortex of healthy human participants and analyzed the theta-band brain activity during an arithmetic calculation task (Uchida-Kraepelin test) before and after tACS. We found enhanced task performance and increased theta-band EEG power during the calculation task after delivering tACS. We did not find any modulations of EEG power during resting conditions before and after tACS. These results indicate that there is a causal link between theta-band neural oscillations in the frontal cortex and information processing for arithmetic calculation.
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